Valve-grinding machine.



P. A.. UDALL. VAIVEGIIINDING IvIAcHIN'E. APPLICATION4 FILED ocr. 9. 1917.

1,295,940. Patented Mar. 4, '1919.

2 SHEETS-SHEET l.

43 BY In AVENTOR.

@ADM

. ATTORNEY.

VALVE GRINDING MACHINE.

APPLICATION F1LD oc.9, 1911.-

2 SHEETS-SHEET 2.

f l 'A TTORNEY,

citizen of theV United States,

:PHILLIP A. UDALL, oF sTooKroN, CALIFORNIA.

'VALVE-GRINDING- MACHINE. p

` Application filed October 9, 1,917. Serial No. 195,647.

To all Lotom it may concern.' i Be it known that I,"PHILLrP A. UDALL, a residing at Stockton, inthe countywof San Joaquin, State of California, have 'invented certain new and useful Improvements in Valve- Grinding Machines; and I do declare the following to be a full, clear, and exact description of the same, reference beinghad to the accompanyingdrawings, and to the characters ofr reference' marked thereon, which form a part of thisapplication.

This invention relates to an' improved means for grinding valves of internal combustion engines.` The object of the invention is Vto provide a machine capable of grinding a pluralityA ofvalves at one time inthe `best improved manner but much more efficiently and quickly than is now the common practice;l To this 'end I provide a mechanical movement whereby the grinding rods are' impartedV an intermittent reversing motion so that the valves will be turned approximately two-thirds of a revolution in one direction, and then reversed one-third of a revolution and so 011, which is the proper method of grindingthem so as to prevent the cutting in of grooves by the grit. also provide a means for intermittently llftmg the valves as they are beingground, s'o Vas to allow the grit to-.flow in between Vthe l seats and the valves.L

A still furtherfobject of the invention is to provide a suitable lever mechanismv for lifting the grinding rods in order 'to position the valves in the machine, land I also provide a compensating means to maintain the proper relative length of therods between the driving gears `and the valves.,

` A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for'which it 1s designed. 'j

These objects I` accomplish by means of suchvstructureand relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference. indicate Vcorresponding parts 1n the several views.' l

Figure 1 is an assembly lview of my complete mechanism, showing but one grindlng specification of Letters Patent."

` shown in' Patented Mar. 4,1919.

rod and connected parts.: `In practice, however,` a large Vnumber of grinding rods may be positioned at one bench and operated by the same mechanism;v l

Fig. 2 is a' plan view of my improved gearing for imparting the intermittent reversing movement to the grinding rods.

' Fig. 3 isFa side elevation of the structure Fig. 4 is a fragmentary view showing how the main driving shaft is geared to the grinding rods.

Fig. 5 is a detached view ofthe cam used for operating the valve lifters.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 designates the bench on which may 'be set the cylinder heads 2, or other valve seating members found desirable, arranged to receive the valves 3. For each of the valves 3 I provide a grinding rod 4, which at its lower end is provided witha 'slidable spring pressed chuck 5` carrying the driver 6, which driver 6 fits into the slot or holes of the valve head 3. The upper end of the rod 4 is slidable through a bushing or sleeve 7, and at its upper end is provided with a beveled gear 8. This beveled gear 8 meshes with another beveled gear 9 on a smallshaft l0. Such shaft 10 is in turn provided with another beveled gear 11 at its opposite end which meshes with still another beveled gear 12 on the main driving shaft 13.

As previously noted, this shaft 13 can be arranged to operate as many of the grinding rods 4 as it may be desired to set over a single bench or table. Each rod `4 is provided with a pair of spaced collars 14, between .which projects a yoke 15 of a hand lever 16.V I/Vhen the rod 4 is to be placed in drivingrelation withthe valve 3 (during which period it is of course desirable to place it out of driving relation with the shaft 13) the lever 16 is used to lift the rod 4. The rod 4 slides in the bushing 7 and lifts the gear 8 out of driving relation with the gear 9, which, of course, stops the movement ofthe rod vand permits the valve 3 to beaplaced in orremoved out of driving relation with such rod 4.

To each grinding rod 4 is imparted a revolutionin- .one direction with an intermittent partial revolution in the reverse direction, bymeans of the following structure, namely: A gear 17 is iiXed to the shaft 13 and intermeshes with a large gear 18 turnabl-e on a stub shaft 19. This gear 18 in turn meshes with a gear 2O fixed to a shaft 21. This shaft 2l is journaled on an oscillating arm or pendulum 22,l mounted for oscillation upon the shaft 19. On theV opposite end of the shaft 21 is a large gear 23 which meshes with a smaller gear 2a fiXed off-center on a driving wheel 25 keyed to aY driving shaft 26. A link arm 27 is sleeved at oneend on to the shaft 21, and at the other end on the stub shaft 28 of 4the gear 24. The function of this link is to maintain the gears 23' and 24: in mesh during the oscillating movement of the pendulum 22. The operation of these gears is as follows: 'i

Assuming that the gear 241 is in a position indicated by the letter A, and that the driving 4wheell 25`is moving in the :direction indicated by the arrow in Fig. 3, this gear 211 can not drive the big gear 23 fast enough for the throw of the arm 27 and so it moves the pendulum 22 and shaft 21 to the right, and at the same time rotates the gear 23 in the direction shown by the arrow on its arm (see Fig. 3). This turns the shaft 21 and the gear 20 in the same direction and drives the gear 18 in the opposite direction or in the direction shown by the arrow in Fig. 3. This movement through the medium of the gear 17 andthe shaft 13, drives the grinding rod 1, for a portion of its revolution, in one direction. When the gear 241, however, reaches the point as at B and starts from that .point back again on its revolution, it swings the pendulum in the opposite direction. The gears may be so proportioned that the movement on the right hand swing of the pendulum turns the gear 18 approximately twothirds of a revolution. The relation of the gears is also such that on the swing of the pendulum to the left, no movement in the direction of the arrow is imparted to the gear 18, but on the contrary its moi-ement is reversed by the swinging pull of the pendulum, which of course reverses the movement of the gear 17, driving shaft 13 and grinding rod 4 for approximately one! third of a revolution. Thus it will be seen that the vvalve 3 will be driven the greater part of a revolution in one direction, and its movement reversed for a small part of a revolution and so on which is the proper movement to impart to it to grind it efn iiciently.

On the main driving shaft 26, I provide a pulley 29 connected by ay belt 30 with an other pulley 31 on a shaft 32. On this shaft 32 are one or more cams 33, which operate against the corresponding rollers 341 mounted on levers 35. These levers 35 are connected by rods 36 connected-through the medium of certain lever and link construction 37 (not particularly described herein) so arranged and relatively positioned that when the rod 36 is'lifted, it lifts a bar 38 continuously in the-same plane whereby set screws 39, carried by said bar, will engage Vand lift the valves 3 as is the approved practice during the grinding operation.

From the `foregoing description it will be readily seen that I have produced such a device as substantially fulfils .the object ofthe invention as set forth h erein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice, such devia-` tions from such detail maybe resorted to asdo not form a departure from thespirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new land useful and desire to secure by Letters Patent, is:

1. A valve grinding machine comprising i-n combination with a plurality of grinding rods arranged for engagement with the valvesa means common to all the rods for rotating them in one ldirection and interi` mittently reversing such rotation for a fraction of a revolution, and means for intermittently lifting the valves during the latter operation, such means including Van arm suspended lengthwisexof the valve stem and under the same, setscrews on the arm in alinement with each stem, a'cam mounted in driving relation with the means'for rotating the grinding rods, andv a cam-actuated rod n connected with ,the suspended .armY wherebythe arm and the valve` stemsf thereabove will be raised k at-l predetermined points in the rotation of the Vgrinding rods.

2. A valve grinding machine comprising in combination with a plurality of grinding rods arranged for `engagement with the valves, a means common to'all the rods for rotating them in one direction and inter-` mittently reversing such Vrotation for a fraction of a revolution, such means in cluding a driven ygear connected in driving relation with the grinding rods, a suspended pendulum havingits point of oscillation concentric with the driven gear, a stub shaft carried in the lower end of the pendulum, a gear on the shaftmeshing with the driven gear, an annular driving member, a gear fixed to the driving member Voffcenter-thereof, a gear. on the pendulum shaft meshing with said fixed gear, and an arm sleeved onto the pendulum shaft and the ixedygear shaft to hold the last'named gearsin mesh during thej rotation of the driving member.

3. A valve grinding machine comprising in combination with a plurality of grinding rodsv arranged for engagement with the valves, a driven gear on each rod, a single driven shaft Connected in driving relation with all the gears on the grinding rods, and means whereby each gear may be placed out of driving relation with the driving shaft independently ofthe others such -conneetion with the driving shaft.

In testimony whereof I aix my signature.

PHILLIP A. UDALL.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

